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GRINDING Abrasive machining: •The oldest machining process - "abrasive shaping"at the beginning of "Stone Era". •Free sand was applied between two moving parts to remove material and shape the stone parts. Grinding: •Removing of metal by a rotating abrasive wheel.(Very high speed, ShallowAppL Archaeological Monitoring and Discovery Plan 20120820. machine operators prior to initiating soil and sediment removal. Project personnel would remains, grave goods, basketry, pestles, mauls and grinding stones, knives, AppL_Archaeological Monitoring and Discovery Plan_20120820.docx 2‐3

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